Transition metal oxides are attractive as anode materials in lithium-ion batteries for their high theoretical capacity and good performance. In this work, an anode material based on manganese-based oxide FeMnO 3 in LIBs is investigated for the first time. FeMnO 3 is prepared with graphene and the FeMnO 3 /graphene composite exhibits a high discharge capacity of 1155.3 mAh g-1 after 300 cycles at 200 mA g-1 , as well as a superior rate performance of 851.7 mAh g-1 at a current density of 3200 mA g-1. The observed extraordinary performance is believed to be attributed to the combination of the intrinsically high capacity of FeMnO 3 , a large surface area of 89.65 m 2 g-1 and good electrical conductivity of the FeMnO 3 /graphene composite. To help clarify the properties of this new material, we employ first principles calculations to determine the structural stability, electronic structure, and Li

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